linux-kernel - [PATCH 0/6] Replace `kernel::str::CStr` with `core::ffi::CStr` (cycle 1)

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Message-Id: <20250704-core-cstr-prepare-v1-0-a91524037783@gmail.com>
Date: Fri, 04 Jul 2025 16:14:51 -0400
From: Tamir Duberstein <tamird@...il.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, Danilo Krummrich <dakr@...nel.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>, 
 Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
 Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 rust-for-linux@...r.kernel.org, Tamir Duberstein <tamird@...il.com>
Subject: [PATCH 0/6] Replace `kernel::str::CStr` with `core::ffi::CStr`
 (cycle 1)

This series makes preparations for the replacement of our custom `CStr`
type with the analogous type available in `core`.

As this is a large migration that touches many subsystems, it will take
place in several cycles, each of which may see multiple series:
1. introduces facades in the kernel crate that downstream
   code can reference. [this series]
2. migrate downstream code to kernel crate facades. (N series, divided
   by subsystem).
3. replace kernel crate facades to allow `Display`ing foreign types
   (such as `core::ffi::CStr`). Replace `CStr` with `core::ffi::CStr`.
4. migrate uses of `c_str!` to C-String literals. Replace references to
   `kernel::str::CStr` with `kernel::ffi::CStr`. (N series, divided by
   subsystem).
5. rename `c_str!` to discourage use. Remove `CStr` reexport from
   `kernel/str.rs`.

Signed-off-by: Tamir Duberstein <tamird@...il.com>
---
Tamir Duberstein (6):
      rust: kernel: remove `fmt!`, fix clippy::uninlined-format-args
      rust: kernel: add `fmt` module
      rust: use `kernel::{fmt,prelude::fmt!}`
      rust: str: remove unnecessary qualification
      rust: add `CStr` methods matching `core::ffi::CStr`
      rust: use `core::ffi::CStr` method names

 drivers/cpufreq/rcpufreq_dt.rs    |  3 +-
 drivers/gpu/nova-core/firmware.rs |  5 +-
 rust/kernel/error.rs              |  8 ++--
 rust/kernel/fmt.rs                |  7 +++
 rust/kernel/lib.rs                |  1 +
 rust/kernel/opp.rs                |  2 +-
 rust/kernel/prelude.rs            |  2 +-
 rust/kernel/print.rs              |  6 +--
 rust/kernel/str.rs                | 97 ++++++++++++++++++++++++---------------
 samples/rust/rust_print_main.rs   |  2 +-
 10 files changed, 83 insertions(+), 50 deletions(-)
---
base-commit: 769e324b66b0d92d04f315d0c45a0f72737c7494
change-id: 20250704-core-cstr-prepare-9b9e6a7bd57e

Best regards,
--  
Tamir Duberstein <tamird@...il.com>